In 1990, Biology profofessors Lud Prevec and Frank Graham modified the adenovirus vector to express a rabies virus glycoprotein to generate an oral vaccine that can be fed to wildlife to immunise them against rabies. It is this very vaccine that is used today in southern Ontario to combat the recent spread of rabies. You can find the original report of their vaccine in their paper (http://www.jstor.org/stable/30119617?seq=1#page_scan_tab_contents) and a local news report on the vaccine inventors, Lud Prevec and Frank Graham (http://www.thespec.com/opinion-story/6227547-paul-wilson-raccoon-rabies-vaccine-is-a-mac-moment/)